why is this invalid syntax? can smeone explain please

Question

horas = float(input("cuanto tiempo trabajaste?"))
salario = float(input("cual es tu salario por hora?"))
sueldo-total = float(horas * salario)
print ("tu salario por hora es de: " , sueldo-total)

Answer 1

sueldo-total is not a valid variable name as variables cannot contain dashes (_), among others. You can use underscore (_) instead: sueldo_total

Answer 2

Sueldo-total is not correct python variable declaration

it must be sueldo_total